Abstract
Light and transmission electron microscopy were used to study mechanisms involved in the separation of the disc from the stalk in juvenileFungia fungites (Scleractinia, Fungiidae). Separation occurs because the skeleton is weakened by dissolution across a distinct plane at the junction of the stalk and disc. The tissue layer adjacent to the skeleton in the stalk was composed of typical, squamose, calicoblastic cells. In contrast, calicoblastic cells in the region of skeletal dissolution were tall and columnar. They contained many microvilli, abundant mitochondria and several different types of vesicles. It is assumed that these calicoblastic cells are actively involved in skeletal dissolution.
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